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Allow the UDL screen refresh rate to be runtime configurable through a

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sysctl. Increase the default frame rate to 25 FPS. Add a comment about
memory constraints.
This commit is contained in:
Hans Petter Selasky 2015-03-07 20:49:32 +00:00
parent a985ae9b4a
commit 61948b2577
1 changed files with 25 additions and 3 deletions
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28
sys/dev/usb/video/udl.c
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@ -60,15 +60,22 @@
#define USB_DEBUG_VAR udl_debug
#include <dev/usb/usb_debug.h>
static SYSCTL_NODE(_hw_usb, OID_AUTO, udl, CTLFLAG_RW, 0, "USB UDL");
#ifdef USB_DEBUG
static int udl_debug = 0;
static SYSCTL_NODE(_hw_usb, OID_AUTO, udl, CTLFLAG_RW, 0, "USB UDL");
SYSCTL_INT(_hw_usb_udl, OID_AUTO, debug, CTLFLAG_RWTUN,
&udl_debug, 0, "Debug level");
#endif
#define UDL_FPS_MAX 60
#define UDL_FPS_MIN 1
static int udl_fps = 25;
SYSCTL_INT(_hw_usb_udl, OID_AUTO, fps, CTLFLAG_RWTUN,
&udl_fps, 0, "Frames Per Second, 1-60");
/*
* Prototypes.
*/
@ -206,14 +213,25 @@ udl_callout(void *arg)
{
struct udl_softc *sc = arg;
const uint32_t max = udl_get_fb_size(sc);
int fps;
if (sc->sc_power_save == 0) {
fps = udl_fps;
/* figure out number of frames per second */
if (fps < UDL_FPS_MIN)
fps = UDL_FPS_MIN;
else if (fps > UDL_FPS_MAX)
fps = UDL_FPS_MAX;
if (sc->sc_sync_off >= max)
sc->sc_sync_off = 0;
usbd_transfer_start(sc->sc_xfer[UDL_BULK_WRITE_0]);
usbd_transfer_start(sc->sc_xfer[UDL_BULK_WRITE_1]);
} else {
fps = 1;
}
callout_reset(&sc->sc_callout, hz / 5, &udl_callout, sc);
callout_reset(&sc->sc_callout, hz / fps, &udl_callout, sc);
}
static int
@ -765,6 +783,10 @@ udl_fbmem_alloc(struct udl_softc *sc)
size = udl_get_fb_size(sc);
size = round_page(size);
/*
* It is assumed that allocations above PAGE_SIZE bytes will
* be PAGE_SIZE aligned for use with mmap()
*/
sc->sc_fb_addr = malloc(size, M_DEVBUF, M_WAITOK | M_ZERO);
sc->sc_fb_copy = malloc(size, M_DEVBUF, M_WAITOK | M_ZERO);
sc->sc_fb_size = size;